--Lance Tokuda, the chief executive of RockYou, which developed the "Super Wall" Facebook application.
I have a difficult time seeing the value in an application that can be developed by a first-year computer science student in one weekend.
Also, if Facebook ever decided to enhance their Wall feature, Super Wall would become obsolete. (Facebook would never cannibalize its highest profile developers like this. At least not yet.)
Most Facebook-only apps are in absurdly precarious business positions: they're features, not products, they've got a low barrier to entry for competitors, and they exist at the whim of a shrewd, aggressive company with a history of "incorporating" applications on its platform into its own product with little regard to the developers who created them.